公开(公告)号：US11801545B2

公开(公告)日：2023-10-31

申请号：US17057723

申请日：2019-04-05

Applicant: Amada Co., Ltd.

Inventor： Yingjun Jin ,  Yohei Fuchinoue ,  Hitoshi Omata

IPC: B21D55/00 ,  B21D5/02

CPC classification number: B21D55/00 ,  B21D5/02 ,  B21D5/0272

Abstract: When a sheet metal is sandwiched between a punch held by a punch holder and a die held by a die holder to bend the sheet metal at a set bending angle by moving the punch toward the die, a stroke calculation unit calculates a stroke of the punch for bending the sheet metal at the bending angle in consideration of a spring back amount of the bent sheet metal. A bending load calculation unit calculates a bending load required to bend the sheet metal at the bending angle. A punch deflection amount calculation unit calculates a punch deflection amount according to the bending load. A punch holder deflection amount calculation unit calculates a punch holder deflection amount according to the bending load. A depth value calculation unit calculates a depth value by adding at least the punch deflection amount and the punch holder deflection amount to the stroke.